[Test-Equipment] HP fans

Tue, 15 Jan 2002 00:11:03 +0100

had a counter, believe it was made by Systron Donner, sounded like a WW2 =
bomb warning siren
73,
Jan_Martin
LA8AK
----- Original Message -----=20

> Try an HP8656A signal generator sometime... the fan sounds like it was =
made
> by Boeing, and it runs even when the unit's turned off!
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> The thing to do is to look at the equipment's original environmental =
specs.
> If you have an instrument with a loud fan, and the manual says the
> instrument is rated for operation at 130 degrees F ambient, and you =
know
> it'll never be hotter than 80F in your lab or ham shack, then by all =
means,
> put a quieter fan in there.
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> On the other hand, if your gear is already running hot with the stock =
fan,
> you may want to leave it alone (or at least check the fan bearings for
> noise).
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> -- jm
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> ----- Original Message -----
> From: "Gary Chatters" <[email protected]>
> To: <[email protected]>
> Sent: Monday, January 14, 2002 2:10 PM
> Subject: [Test-Equipment] HP fans
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> > As long as someone brought up the 5245L:  One of the problems with
> > the older HP equipment and even some not so old equipment is the
> > fan noise.  I would like to leave a frequency counter on for long
> > periods of time, but it would be difficult to live with the noise.
> >
> > I am thinking of replacing the stock fan with a quieter muffin
> > style fan.  Has anyone tried this and had any problems?
> > Is there anything critical about the cooling?  My impression is
> > that you just have to have some air movement.  But to be sure, one
> > should check the internal temperature.
> >
> > Gary
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